Digital mini scale ON BALANCE MTT-200 reading 50g weight wrongly

Dear Experts I have got Digit scale ON BALANCE MTT-200 reading 50g weight wrongly. What I did I pressed the Calibration button scale was showing reading 200g I guess it was asking for 200g weight which I don't have one,,,,,I don't mind to buy it if that will fix the issue What other troubleshoots should I do ? Photos attached showing scale and weight and wrong reading > https://imgur.com/a/b4so9ac Thx